Combine the soymilk and vinegar in a microwave-safe bowl; it will curdle and resemble buttermilk.
Add the oil, lemon zest, agave nectar, mustard, salt, and cornstarch.
Use an immersion blender to blend for 1 minute.
Microwave for 1 minute, keeping an eye on it to avoid bubbling over.
Remove from the microwave, blend again.
Return to the microwave for another 1 minute, then blend once more.
Microwave for 1 additional minute, then let the mayo cool.
Stir with a fork to break up the skin that forms on top.
Transfer to an airtight container and refrigerate.
Stir again before using.
Notes / Tips / Wine Advice:
Serving Tip:This mayo works perfectly in coleslaw, as a sandwich spread, or as a base for dressings.Wine Advice:Pair with a light, crisp white wine such as Sauvignon Blanc for a refreshing contrast.